[Sturdy and durable material] - The bicycle training wheels are made of high quality rubber with steel support arms, which are durable and not easy to damage. Ideal for stability and safety, it helps children quickly find their balance and prevent falls. [Strong support arm] - The support arm of the small bike support caster is made of high quality steel, not easy to rust and corrode, and the thickness is 3mm. It is more durable than traditional clamps and is not easy to be damaged. It is a practical helper for childrens bicycles, which can better ensure the safety of children when riding. [ Adjustable design] - There are 5 pants on the auxiliary wheel support arm, you can adjust the height according to the wheel size, suitable for 12-20 inch childrens bicycles, it can meet your needs, please make sure your bicycle rear wheel bearing can be equipped before purchasing the auxiliary wheel. [Easy to assemble] - This kit includes 1 pair of black bicycle wheels with two arms bracket and corresponding screws, you can use it to quickly and easily install small bicycle wheels on your bicycle, very convenient and quick. [Good Kids Bike Helper] - This bicycle stabilizer for children is perfect for boys and girls who want to learn to ride a bike, it is designed for the beginner cycling practice. Ideal for learning on a bike with a childrens bike rear wheel to start gaining confidence on the bike and eliminating your fears.